220 MICROSCOPY FOR BEGINNERS. 



the four posterior ones. The foot is long and narrow, 

 and has two toes. Eggs are occasionally to be noticed 

 attached to the posterior part of the carapace. 



14. PHILODINA (Fig. 154). 



This is readily distinguished from the common Roti- 

 fer (Rotifer vulgaris) by the spines scattered over the 

 back and sides of the hardened and minutely roughened 

 body, by the three toes, and by the two eyes 

 being some distance from the front border, 

 while in Rotifer vulgaris they are close togeth- 

 er on the proboscis. The species referred to is 

 shown in the figure with the body partly con- 

 Fig. 164. tracted, the ciliary disks and foot entirely so. 

 The body is flexible, yet the skin is hardened 

 and bears the conspicuous recurved spines, two of which 

 are on the sides one on each and pointing forward. 

 The tail is divided into two parts, which are shown in 

 the figure, projecting beyond the body. The Rotifer is 

 peculiar, and not uncommon. I have found it in sum- 

 mer, and have taken it from under the ice in February. 



